Is this a positive opk?

I’ve started tracking my cycle to get pregnant and for the last 3/4 days my opk has only had the control line. Now today it looks like this? Is this positive? Am I ovulating? I don’t know how it would go from nothing to so dark in one day. I’m just confused lol bd last night and hubby will be home at 10pm tonight.. is there still a chance I could get pregnant this month or will I miss it?